Tarasios’s name day is February 25, the feast of Tarasios.
Churches that follow the Old (Julian) Calendar keep the same feast on March 10 (a day earlier in leap years) of the civil calendar. See everything commemorated on February 25.
The saint behind the name

Tarasios
February 25, Hierarch, Ταράσιος
St. Tarasios was Patriarch of Constantinople at the end of the eighth century. A layman of high imperial office renowned for learning and virtue, he was raised to the patriarchal throne at a time when the Church was torn by the iconoclast heresy, and he accepted on the condition that the veneration of the holy icons be restored.
Name days: Tarasios
What to say on a name day
The Greek wish is Χρόνια Πολλά (Chronia Polla), “many years.” A call or a short message on the day is what people remember. See name day wishes you can send and what a name day is.